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Response spectrum analysis of a multi-storey building requires the

  • A.complete time history of the ground motion
  • B.exact yield strength of every member
  • C.construction sequence of the frame
  • D.natural periods and mode shapes of the structure

Answer: D

Each mode is treated as a separate single-degree-of-freedom system, read against the spectrum at its own period, and the modal responses are then combined. No time history is needed, which is what makes the method economical.

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